<template>
  <div class="upload-box">
    <el-dialog
      :title="state.dialogTitle"
      :width="state.dialogWidth"
      v-model="state.isShowDialog"
      :before-close="closeDialog"
    >
      <!-- 裁剪预览 -->
      <div
        v-if="imageSrc"
        style="display: flex; justify-content: space-between; align-items: center"
      >
        <div
          style="
            width: 50%;
            padding: 10px;
            background-color: #f5f5f5;
            display: flex;
            justify-content: center;
            align-items: center;
          "
        >
          <img
            ref="previewImage"
            :src="croppedImageSrc || imageSrc.toString()"
            alt="Preview Image"
            style="max-width: 100%; height: auto"
          />
        </div>
        <div
          style="
            width: 50%;
            padding: 10px;
            display: flex;
            justify-content: center;
            align-items: center;
          "
        >
          <img
            ref="uploadImage"
            :src="imageSrc.toString()"
            alt="Source Image"
            style="max-width: 100%; height: auto"
            @click="clearImage"
          />
        </div>
      </div>

      <!-- 裁剪工具栏 -->
      <div v-if="imageSrc" style="margin-top: 20px; text-align: center">
        <el-button @click="clearImage">重新选择</el-button>
        <el-button type="primary" @click="rotateLeft(-5)">左转</el-button>
        <el-button type="primary" @click="rotateRight(5)">右转</el-button>
        <el-button type="primary" @click="changeScale(0.1)">放大</el-button>
        <el-button type="primary" @click="changeScale(-0.1)">缩小</el-button>
        <el-button type="warning" @click="cropImage">裁剪图片</el-button>
        <el-button type="success" @click="uploadCroppedImage">上传</el-button>
      </div>

      <!-- Conditional display for upload component -->
      <div v-if="!imageSrc">
        <el-upload
          v-if="isCropper"
          class="upload-demo"
          drag
          multiple
          v-model:file-list="localImageUrl"
          limit="1"
          :show-file-list="false"
          :before-upload="beforeUpload"
        >
          <el-icon class="el-icon--upload">
            <upload-filled />
          </el-icon>
          <div class="el-upload__text">
            文件拖到这里 或者
            <em>点击图标选取上传</em>
          </div>
          <template #tip>
            <div class="el-upload__tip">不大于500kb的Jpg /png文件</div>
          </template>
        </el-upload>
        <el-upload
          :key="uuid"
          v-else
          class="upload-demo"
          action="#"
          :http-request="handleHttpUpload"
          :headers="httpFileHeaders"
          :on-remove="handleRemove"
          :before-remove="beforeRemove"
        >
          <el-icon class="el-icon--upload">
            <upload-filled />
          </el-icon>
          <div class="el-upload__text">
            文件拖到这里 或者
            <em>点击图标选取上传</em>
          </div>
          <template #tip>
            <div class="el-upload__tip">不大于500kb的Jpg /png文件</div>
          </template>
        </el-upload>
      </div>
    </el-dialog>
    <!--  最后图片展示  -->
    <div v-if="props.endShow">
      <div class="upload">
        <div class="el-upload">
          <template v-if="localImageUrl">
            <img :src="localImageUrl" class="upload-image" alt="" />
            <div class="upload-handle" @click.stop>
              <!--                            <div v-if="!self_disabled" class="handle-icon" @click="isCropper?openCropper:editImg">-->
              <!--                                <el-icon>-->
              <!--                                    <Edit />-->
              <!--                                </el-icon>-->
              <!--                                <span>{{isCropper?"裁剪":"编辑"}}</span>-->
              <!--                            </div>-->
              <div class="handle-icon" @click="imgViewVisible = true">
                <el-icon>
                  <ZoomIn />
                </el-icon>
                <span>查看</span>
              </div>
              <div v-if="!self_disabled" class="handle-icon" @click="deleteImg">
                <el-icon>
                  <Delete />
                </el-icon>
                <span>删除</span>
              </div>
            </div>
          </template>
          <template v-else>
            <div class="upload-empty" @click="openDialog">
              <slot name="empty">
                <el-icon>
                  <Plus />
                </el-icon>
                <span>请上传图片</span>
              </slot>
            </div>
          </template>
        </div>
      </div>
      <el-image-viewer
        v-if="imgViewVisible"
        :url-list="[localImageUrl]"
        @close="imgViewVisible = false"
      />
    </div>
  </div>
</template>
<script setup lang="ts">
  import {
    ref,
    nextTick,
    onBeforeUnmount,
    reactive,
    computed,
    inject,
    watch,
    onMounted,
  } from 'vue';
  import {
    ElMessage,
    formContextKey,
    UploadProps,
    UploadRequestOptions,
    formItemContextKey,
    UploadUserFile,
    ElMessageBox,
  } from 'element-plus';
  import Cropper from 'cropperjs';
  import 'cropperjs/dist/cropper.css';
  import { Delete, Plus, UploadFilled, ZoomIn, Edit } from '@element-plus/icons-vue';
  import { uploadImg } from '/@/views/system/upload';
  import { generateUUID } from '/@/utils/mms';
  import { RefType } from '/@/types/global';
  import { Session } from '/@/utils/storage';
  const httpFileHeaders = ref({
    Authorization: `${Session.get('token')}`,
  });
  // 向父组件传递消息，可以传递任意类型的数据，需要 @ 符号 监听捕获
  const emit = defineEmits<{
    'update:modelValue': [value: any];
    success: [value: any];
  }>();
  // 接受父组件参数
  const props = defineProps({
    modelValue: {
      type: String,
      default: '',
    },
    // 是否可编辑/删除
    disabled: {
      type: Boolean,
      default: true,
    },
    // 是否显示最后图片
    endShow: {
      type: Boolean,
      default: true,
    },
    fileSize: {
      type: Number,
      default: 1,
    },
    // 显示图片高度
    height: {
      type: String,
      default: '150px',
    },
    // 显示图片宽度
    width: {
      type: String,
      default: '150px',
    },
    // 显示图片圆角
    borderRadius: {
      type: String,
      default: '8px',
    },
    //是否裁剪
    isCropper: {
      type: Boolean,
      default: false,
    },
    //裁剪宽度
    cropperWidth: {
      type: Number,
      default: 400,
    },
    //裁剪高度
    cropperHeight: {
      type: Number,
      default: 400,
    },
  });
  const imageSrc = ref<string | ArrayBuffer | null>(null);
  const localImageUrl = ref(props.modelValue);
  const croppedImageSrc = ref(null);
  // 生成组件唯一id
  const uuid = ref(generateUUID());
  const uploadImage = ref(null);
  const previewImage = ref(null);
  // 查看图片
  const imgViewVisible = ref(false);

  // 在组件挂载后执行一些逻辑
  onMounted(() => {
    localImageUrl.value = props.modelValue;
    // 可以在这里执行初始化逻辑，比如获取数据等
  });
  // 自定义值
  const state = reactive({
    dialogWidth: '800px',
    dialogTitle: props.isCropper ? '图片裁剪上传' : '图片上传',
    isShowDialog: false,
    cropperImg: '',
    cropperImgBase64: '',
    cropper: '' as RefType,
  });

  // 监听图片地址变化,改变 localImageUrl 的值
  watch(
    () => props.modelValue,
    (newVal) => {
      localImageUrl.value = newVal;
    }
  );
  // 获取 el-form 组件上下文
  const formContext = inject(formContextKey, void 0);
  // 判断是否禁用上传和删除
  const self_disabled = computed(() => {
    return !props.disabled || formContext?.disabled;
  });
  // 上传
  const handleHttpUpload = async (options: UploadRequestOptions) => {
    let formData = new FormData();
    formData.append('file', options.file);
    try {
      await uploadImg(formData).then((res) => {
        emit('update:modelValue', res.data.url);
        emit('success', res.data);
        state.isShowDialog = false;
        // 调用 el-form 内部的校验方法（可自动校验）
        ///formItemContext?.prop && formContext?.validateField([formItemContext.prop as string])
      });
    } catch (error) {
      options.onError(error as any);
    }
  };
  //删除前
  const beforeRemove: UploadProps['beforeRemove'] = (uploadFile, uploadFiles) => {
    return ElMessageBox.confirm(`确定要删除 ${uploadFile.name} ?`).then(
      () => true,
      () => false
    );
  };
  //删除
  const handleRemove: UploadProps['onRemove'] = (file, uploadFiles) => {
    emit('update:modelValue', '');
  };

  // ======================================裁剪===========================================

  /**
   * 裁剪选择图片后
   * @param file
   */
  const beforeUpload: UploadProps['beforeUpload'] = (file) => {
    const isImage = file.type.startsWith('image/');
    if (!isImage) {
      ElMessage.error('只能上传图片文件');
      return false;
    }
    const reader = new FileReader();
    reader.onload = async (e) => {
      imageSrc.value = e.target ? e.target.result : null;
      await nextTick();
      initCropper();
    };
    reader.readAsDataURL(file);
    return false;
  };
  /**
   * 裁剪初始化
   */
  const initCropper = () => {
    if (state.cropper) {
      state.cropper.destroy();
    }
    if (!uploadImage.value) return;
    state.dialogWidth = '60%';
    state.dialogTitle = '图片裁剪 ( ' + props.cropperWidth + ' x ' + props.cropperHeight + ' )';
    state.cropper = new Cropper(uploadImage.value, {
      aspectRatio: props.cropperWidth / props.cropperHeight, // 设置裁剪框的宽高比
      viewMode: 1, // 限制裁剪框不超过画布大小
    });
  };
  // 修改图片大小 正数为变大 负数变小
  const changeScale = (num: number) => {
    num = num || 1;
    state.cropper.zoom(num);
  };
  // 向左边旋转90度
  const rotateLeft = (num: number) => {
    num = num || 1;
    state.cropper.rotate(num);
  };
  // 向右边旋转90度
  const rotateRight = (num: number) => {
    num = num || 1;
    state.cropper.rotate(num);
  };
  /**
   * 裁剪图片
   */
  const cropImage = () => {
    if (state.cropper) {
      const canvas = state.cropper.getCroppedCanvas({
        width: props.cropperWidth,
        height: props.cropperHeight,
      });
      // base64 格式
      croppedImageSrc.value = canvas.toDataURL('image/png');
    }
  };
  /**
   * 删除
   */
  const clearImage = () => {
    state.isShowDialog = true;
    imageSrc.value = null;
    croppedImageSrc.value = null;
    state.dialogWidth = '600px';
    if (state.cropper) {
      state.cropper.destroy();
      state.cropper = null;
    }
    uuid.value = generateUUID();
  };
  /**
   * 上传图片
   */
  const uploadCroppedImage = async () => {
    if (!croppedImageSrc.value) {
      ElMessage.error('请先裁剪图片');
      return;
    }
    try {
      const blob = dataURLToBlob(croppedImageSrc.value);
      const formData = new FormData();
      formData.append('file', blob, 'avatar.png'); // 注意这里的表单字段名应为'file'
      await uploadImg(formData).then((response) => {
        if (response.code === 200) {
          emit('update:modelValue', response.data.url);
          ElMessage.success('上传成功');
          state.isShowDialog = false;
          if (props.endShow) {
            localImageUrl.value = response.data.url;
          }
          emit('success', localImageUrl.value);
        } else {
          ElMessage.error(response.data.msg || '上传失败');
        }
      });
    } catch (error) {
      ElMessage.error('上传失败');
    }
  };

  const dataURLToBlob = (dataURL: any) => {
    const arr = dataURL.split(',');
    const mime = arr[0].match(/:(.*?);/)[1];
    const bstr = atob(arr[1]);
    let n = bstr.length;
    const u8arr = new Uint8Array(n);
    while (n--) {
      u8arr[n] = bstr.charCodeAt(n);
    }
    return new Blob([u8arr], { type: mime });
  };

  onBeforeUnmount(() => {
    if (state.cropper) {
      state.cropper.destroy();
    }
  });
  /**
   * 预览 编辑图片
   * */
  const editImg = () => {
    state.dialogWidth = '600px';
    state.isShowDialog = true;
    imageSrc.value = null;
  };
  /**
   * 预览 删除图片
   * */
  const deleteImg = () => {
    imageSrc.value = null;
    croppedImageSrc.value = null;
    localImageUrl.value = '';
    state.dialogWidth = '600px';
    emit('update:modelValue', localImageUrl.value);
    if (!props.isCropper) {
      uuid.value = generateUUID();
    }
  };
  /**
   * 预览 裁剪
   */
  const openCropper = async () => {
    imageSrc.value = localImageUrl.value;
    state.dialogWidth = '60%';
    state.isShowDialog = true;
    await nextTick();
    initCropper();
  };
  /**
   * 显示裁剪
   */
  const openDialog = () => {
    imageSrc.value = null;
    croppedImageSrc.value = null;
    localImageUrl.value = '';
    state.dialogWidth = '600px';
    state.isShowDialog = true;
  };
  /**
   * 关闭裁剪
   */
  const closeDialog = () => {
    state.isShowDialog = false;
  };

  // 暴露给父组件的方法 可以直接 ref 方式绑定组件 调佣方法
  defineExpose({
    openDialog,
  });
</script>
<style scoped lang="scss">
  .upload-demo {
    display: block;
    width: 100%;
    margin-bottom: 20px;
  }
  .upload-demo .el-upload {
    display: block;
    width: 100%;
    margin-bottom: 20px;
  }
  .el-upload__text {
    color: #606266;
    font-size: 14px;
    line-height: 22px;
    margin-top: 5px;
  }

  .el-upload__tip {
    color: #909399;
    font-size: 12px;
    line-height: 1.5;
    margin-top: 7px;
  }

  .is-error {
    .upload {
      :deep(.el-upload),
      :deep(.el-upload-dragger) {
        border: 1px dashed var(--el-color-danger) !important;

        &:hover {
          border-color: var(--el-color-primary) !important;
        }
      }
    }
  }

  :deep(.disabled) {
    .el-upload,
    .el-upload-dragger {
      cursor: not-allowed !important;
      background: var(--el-disabled-bg-color);
      border: 1px dashed var(--el-border-color-darker) !important;

      &:hover {
        border: 1px dashed var(--el-border-color-darker) !important;
      }
    }
  }

  .upload-box {
    .no-border {
      :deep(.el-upload) {
        border: none !important;
      }
    }
    .upload {
      margin: 10px 10px 10px 0;
    }
    :deep(.upload) {
      .el-upload {
        position: relative;
        display: flex;
        align-items: center;
        justify-content: center;
        width: v-bind(width);
        height: v-bind(height);
        overflow: hidden;
        border: 1px dashed var(--el-border-color-darker);
        border-radius: v-bind(borderRadius);
        transition: var(--el-transition-duration-fast);

        &:hover {
          border-color: var(--el-color-primary);

          .upload-handle {
            opacity: 1;
          }
        }

        .el-upload-dragger {
          display: flex;
          align-items: center;
          justify-content: center;
          width: 100%;
          height: 100%;
          padding: 0;
          overflow: hidden;
          background-color: transparent;
          border: 1px dashed var(--el-border-color-darker);
          border-radius: v-bind(borderRadius);

          &:hover {
            border: 1px dashed var(--el-color-primary);
          }
        }

        .el-upload-dragger.is-dragover {
          background-color: var(--el-color-primary-light-9);
          border: 2px dashed var(--el-color-primary) !important;
        }

        .upload-image {
          width: 100%;
          height: 100%;
          object-fit: contain;
        }

        .upload-empty {
          position: relative;
          display: flex;
          flex-direction: column;
          align-items: center;
          justify-content: center;
          font-size: 12px;
          line-height: 30px;
          color: var(--el-color-info);

          .el-icon {
            font-size: 28px;
            color: var(--el-text-color-secondary);
          }
        }

        .upload-handle {
          position: absolute;
          top: 0;
          right: 0;
          box-sizing: border-box;
          display: flex;
          align-items: center;
          justify-content: center;
          width: 100%;
          height: 100%;
          cursor: pointer;
          background: rgb(0 0 0 / 60%);
          opacity: 0;
          transition: var(--el-transition-duration-fast);

          .handle-icon {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            padding: 0 6%;
            color: aliceblue;

            .el-icon {
              margin-bottom: 40%;
              font-size: 130%;
              line-height: 130%;
            }

            span {
              font-size: 85%;
              line-height: 85%;
            }
          }
        }
      }
    }

    .el-upload__tip {
      line-height: 18px;
      text-align: center;
    }
  }
</style>
